1. aluminum electrolytic capacitor industry status
Capacitor is one of the three passive electronic components (resistors, capacitors and inductors), occupies an important position in the electronic components industry, is an essential basic electronic components in the electronic circuit, in the whole machine used in electronic components, capacitors are widely used, the amount of large, accounting for about 40% of all electronic components, capacitors are mainly divided into four categories according to different dielectrics: aluminum electrolytic capacitors, tantalum electrolytic capacitors, ceramic capacitors and film capacitors. Among them, aluminum electrolytic capacitors have the significant advantages of high CV value per unit volume and high cost performance. Their output value accounts for about 1/3 of the entire capacitor market. And with the development of new energy and new energy vehicles, frequency conversion technology and other new industries, its annual growth rate remains stable at about 8%, and may further expand market share in the future.
The basic role of aluminum electrolytic capacitors in electronic circuits is generally summarized as: through AC, DC resistance, with filtering, bypass, coupling and rapid charge and discharge functions, and has the characteristics of small size, large storage capacity, and high cost performance. With the advancement of modern technology and the continuous improvement of capacitor performance, aluminum electrolytic capacitors have been widely used in consumer electronics products, communication products, computers and peripheral products, new energy, automation control, automotive industry, optoelectronic products, high-speed railways and aviation and military equipment. As the key basic raw material of aluminum electrolytic capacitors, aluminum foil is the part with high technical content and added value in the whole aluminum electrolytic capacitor, and the quality of aluminum foil directly affects the quality of its downstream products, and then affects the quality of the end products. In recent years, with the accelerated transfer of aluminum electrolytic capacitor production base to China and the rapid growth of output, China's electronic aluminum foil processing industry has developed rapidly.
Definition of (I) aluminum electrolytic capacitor
Aluminum electrolytic capacitor is a kind of capacitor with positive electrode and negative electrode. The basic structure of aluminum electrolytic capacitor is a capacitor which is made of a layer of anode aluminum foil, a layer of cathode aluminum foil and a layer of liner paper impregnated with electrolyte and a natural oxide film by overlapping and winding. After the electrode is immersed in electrolyte, it is closed by aluminum shell and glue cover.